Miller Trailblazer only outputting 10v in CV mode
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  1. #1
    Join Date
    Feb 2019
    Posts
    59

    Miller Trailblazer only outputting 10v in CV mode

    Was running an LN-25 off a Trailblazer 301G when stuff went to crap. The volt meter on the LN-25 dropped, and the welds got really cold. I tried adjusting the voltage knob, but to no avail.

    I decided to diagnose it right at the engine drive output terminals just to see, and sure enough she was only outputting 10v, regardless of where I set the voltage knob. I haven't tested the machine on CC mode yet to see if it's just a bad rheostat. That will be my next step.

    I wasn't sure if it just outputs 10v until it detects a suitcase, then it ramps up to the indicated voltage, in which case the suitcase is probably to blame. Just figured I'd consult the hivemind before I get in too deep.
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  2. #2
    Join Date
    Jun 2010
    Location
    in the shadow of the sears tower
    Posts
    249

    Re: Miller Trailblazer only outputting 10v in CV mode

    Give them a call

    Miller Electric Manufacturing Co.
    1635 W. Spencer St.
    P.O. Box 1079
    Appleton, WI 54912-1079

    Phone: 920-734-9821

  3. #3
    Join Date
    Feb 2019
    Posts
    59

    Re: Miller Trailblazer only outputting 10v in CV mode

    Thanks
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  4. #4
    Join Date
    Feb 2019
    Posts
    59

    Re: Miller Trailblazer only outputting 10v in CV mode

    Just an update, I switched back to CC mode for testing.

    Turned the amperage knob all the way down and struck and arc. About what you'd expect, very weak arc that would barely stay lit with some 3/32" 6011.

    Cranked the knob all the way up. Same exact arc.

    So I'm thinking the rheostat is bad. I'll test it with an ohm meter to confirm, but hopefully it's that and not something more insidious.
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  5. #5
    Join Date
    Feb 2019
    Posts
    59

    Re: Miller Trailblazer only outputting 10v in CV mode

    Got in touch will Miller, turns out the 120v plugs are dead. I've been instructed by the tech guy to check the brushes and slip rings.
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